[26] Boruc made his debut for Celtic on 2 August 2005 when he replaced David Marshall for the second leg of their UEFA Champions League qualifier tie against Slovakian side Artmedia Bratislava.

[27] Boruc quickly established himself as first-choice keeper at Celtic, displaying a combination of outstanding shot-stopping, immense self-belief and, at times, outright arrogance.

[28][29] Indeed, gestures allegedly made by Boruc towards Rangers fans at Ibrox Stadium on 12 February 2006 later resulted in the player being cautioned by the police.

[34] Indeed, Boruc succeeded in keeping a clean sheet in each of Celtic's three home Champions League group stages games (Copenhagen 1–0,[35] Benfica 3–0[36] and Manchester United 1–0).

[47] Discipline, however, also became an issue again, with Boruc fined £500 by the Scottish Football Association (SFA) for gestures he made towards Rangers fans during the Old Firm game in August.

[52] On 4 May 2010, Boruc made the last appearance of his Celtic career in a 2–1 victory against Old Firm rivals Rangers,[53] although he had to be substituted in the second half as he was unable to continue playing due to an injury he sustained to his hand in the pre-match warm up.

[69] On 28 October 2012, he was allegedly involved in an incident following Tottenham Hotspur's second goal, when he responded to the jeers coming from behind him by sarcastically applauding the home fans, before throwing a water bottle in their direction.

[72] Despite the early controversy in his Southampton career, Boruc regained his place in the first team and played in all the club's league matches from 1 January 2013 to the end of the season.

The club's 2–0 win over Fulham on 26 October 2013 saw the team move to 18 points and into third place in the Premier League, their best-ever start to a top-flight season.

[82] Boruc returned from injury on 11 January 2014[83] and kept a clean sheet in Southampton's 1–0 win over West Bromwich Albion, impressing with a last minute save from Shane Long to deny the club an equaliser.

[84] Boruc maintained his place in his side, and although he was at fault for one of Sunderland's goals in a 2–2 draw on 18 January,[85] he redeemed himself with better performances in 1–0 and 3–0 league wins over Fulham and Hull City respectively during February 2014.

[88] At the start of the 2014–15 season, Fraser Forster arrived at Southampton from Celtic in a £10 million transfer deal, with the Englishman taking over Boruc's place in goal.

[94] Boruc began the 2015–16 season as Bournemouth's first choice goalkeeper, starting the club's first ever top division match against Aston Villa on 8 August 2015.

[96] After a poor performance in a 1–5 home defeat by Tottenham Hotspur on 25 October, Boruc was replaced in the Bournemouth goal by Adam Federici for all four of the Cherries' November fixtures.

[97] An injury to Federici saw Boruc return to the side for an away fixture at Premier League champions Chelsea on 5 December, with the Polish goalkeeper keeping a clean sheet in a 1–0 win for Bournemouth.

[5] On 28 April 2004, Boruc debuted for the Polish senior squad in a goalless friendly draw against the Republic of Ireland, coming on as second-half substitute for Jerzy Dudek.

[104] The same year on 12 July, Boruc made his first starting appearance for Poland in another friendly draw against the United States,[105][better source needed] saving a penalty in the 11th minute from American striker Brian McBride.

Boruc had been fighting with Tomasz Kuszczak and Łukasz Fabiański for the starting slot, but was first choice goalkeeper during the World Cup and played in all three of their games.

[109] The famous Polish striker from the late 1970s and 1980s, Zbigniew Boniek, criticised Poland's team performance at Euro 2008 but singled out Boruc for praise, describing him as "world class.

[111] However, Boruc quickly regained his place in the team and continued to be the regular choice until falling from favour again in October 2010 under Beenhakker's successor as Poland manager, Franciszek Smuda.

[112] After a two-year absence, Boruc was called up again to the Polish squad in January 2013[113] and played in their 0–2 defeat against the Republic of Ireland a week later on 6 February 2013.

[114] Boruc maintained his place in the international side for their next two competitive games on 22 and 26 March 2013, World Cup qualifiers against Ukraine[115] and San Marino[116] respectively.

[118] In March 2017, Boruc announced his retirement from international football through his Instagram profile, citing his age, "peace of mind" regarding the position of a Polish goalkeeper, and focusing on his career in Bournemouth.

[119] He earned his 65th and final appearance during his farewell match against Uruguay on 10 November 2017 in Warsaw, coming off as a substitute shortly before half-time by former Legia Warszawa teammate, Łukasz Fabiański.

On 25 August 2006, Boruc was cautioned by the Strathclyde Police for a breach of the peace for making gestures in front of Rangers fans before a game earlier that year.

"[123] According to a cross-party working group of the Scottish Parliament, "the sign of the cross in itself is an expression of the Roman Catholic faith; however, using it to alarm, upset or provoke others might be a breach of the peace at common law.

"[124] The Catholic Church condemned the legal action, however, expressing regret that "Scotland seems to have made itself one of the few countries in the world where this simple religious gesture is considered an offence.

"[127] The Roman Catholic Church welcomed the Crown Office's clarification of the limited action taken against Boruc, particularly the statement that it "did not in any way refer to the act of blessing himself.

[136] In September 2009, The Scottish Sun published an apology, for claiming Boruc had had an affair with a young woman, shown in a photograph, who was actually his sister.

In June 2011, the News of the World admitted it had published a false report on Boruc, and paid him £70,000, believed to be a record for Scottish libel cases, plus legal expenses.